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Patent US3845333A successfully refreshed from Google Patents.
US3845333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate lead/ceramic stave free-flooded cylindrical transducer
Assignee: United States Department of the Navy
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Filing: 1973-09-27
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Granted: 1974-10-29
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Expires: 1993-09-27
Abstract
Abstract A transducer having a cylindrically shaped arrangement of alternating ferroelectric elements and loading members provides a continuous broadband capability. By the transducer''s discrete dimensioning, it simultaneously functions in the cavity resonance mode, the circumferential resonance mode and the bending resonance mode to create the broadband operating characteristics. Because of the configuration and dimensioning, these three resonance modes are located contiguously in two octaves in the low frequency spectrum.
Inventors
- 👤 J Holloway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0633
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
220 words
A transducer of acoustic energy having broadband frequency response comprising: a plurality of polarized, elongate, stave-shaped ferro-electric elements arranged in a cylindrical shell configuration; a pair of electrical conductors suitably coupled to electrically interconnect said polarized ferroelectric elements in parallel; means disposed on said pair of electrical conductors for providing electrical insulation therefor; and a pLurality of elongate loading members each interposed between and bonded onto separate pairs of said polarized ferroelectric elements, said loading members having a cross-sectional configuration made up of a rectangular portion interposed between said pairs of polarized ferroelectric elements and an integrally joined semi-circular portion extending radially inwardly to change the symmetry and geometry of said cylindrical shell, said loading members also being formed from a material having a density and mass for lowering the frequency band attributed to the circumferential resonance mode, said polarized ferroelectric elements and said loading members being dimensioned to provide a bandwidth attributed to the cavity resonance mode adjacent and below said frequency band of said circumferential resonance mode, and said polarized ferroelectric elements and said loading members having sufficient lengths to create a passband attributed to the bending resonance mode adjacent and above said frequency band of said circumferential resonance mode, said bandwidth, said frequency band, and said passband cooperating to provide said broadband frequency response over two octaves.
Claim 2
Dependent Claim
220 words
A transducer of acoustic energy having broadband frequency response comprising: a plurality of polarized, elongate, stave-shaped ferro-electric elements arranged in a cylindrical shell configuration; a pair of electrical conductors suitably coupled to electrically interconnect said polarized ferroelectric elements in parallel; means disposed on said pair of electrical conductors for providing electrical insulation therefor; and a pLurality of elongate loading members each interposed between and bonded onto separate pairs of said polarized ferroelectric elements, said loading members having a cross-sectional configuration made up of a rectangular portion interposed between said pairs of polarized ferroelectric elements and an integrally joined semi-circular portion extending radially inwardly to change the symmetry and geometry of said cylindrical shell, said loading members also being formed from a material having a density and mass for lowering the frequency band attributed to the circumferential resonance mode, said polarized ferroelectric elements and said loading members being dimensioned to provide a bandwidth attributed to the cavity resonance mode adjacent and below said frequency band of said circumferential resonance mode, and said polarized ferroelectric elements and said loading members having sufficient lengths to create a passband attributed to the bending resonance mode adjacent and above said frequency band of said circumferential resonance mode, said bandwidth, said frequency band, and said passband cooperating to provide said broadband frequency response over two octaves.
Claim 3
Dependent Claim
20 words
A transducer according to claim 1 in which said transducer is freely flooded rendering it nonresponsive to ambient pressure changes.
Claim 4
Dependent Claim
37 words
A transducer according to claim 2 in which said material of said loading members have a lower sound velocity than said polarized ferroelectric elements for ensuring the lowering of said frequency band of said circumferential resonance mode.
Claim 5
Dependent Claim
34 words
A transducer according to claim 3 in which said loading members are longitudinally slotted for making the transducer more compliant and consequently lowering the frequency of said frequency band of said circumferential resonance mode.
Claim 6
Dependent Claim
53 words
A transducer according to claim 4 in which said polarized ferroelectric elements and said loading members are dimensioned to define a cylindrically shaped transducer with a diameter of 4-and- 1/2 inches and a height of 5 inches to ensure said broadband frequency response over a band of from 2.4 kHz to 9.6 kHz.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |